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Glossary - I

IAP	Instrument Approach Plate
IAS	Indicated Airspeed
ICAO	International Civil Aviation Organization
ICBM	Intercontinental Ballistic Missile
IDENT	Identification
IFF	Identification Friend or Foe
IFR	Instrument Flight Rules
ILS	Instrument Landing System
IMC	Instrument Meteorological Conditions
INBD	Inbound
INS	Inertial Navigation System
interrupter gear	A device that interrupts the firing of a rigidly mounted machine gun to prevent it firing as the aircraft's propeller blade passes in front of the gun barrel